Measurement of dose distributions using film in therapeutic electron beams

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Medical Physics; (USA)

DOI:https://doi.org/10.1118/1.596409· OSTI ID:5351375

Shiu, A S; Otte, V A; Hogstrom, K R ^[1]

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1. Department of Radiation Physics, The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030 (US)

The feasibility of using film dosimetry data as the input data for patient treatment planning was evaluated. The central-axis depth dose and the off-axis ratios obtained from film measurements in a solid phantom were compared with those of ion-chamber measurements in water. Two techniques were used to generate isodose distributions. The first technique used only the film data, i.e., the central-axis depth dose and the off-axis ratios used for the reconstruction were determined from the film optical density (corrected for film nonlinearity). In the second technique, the central-axis depth dose measured by an ion chamber in a water phantom was combined with the off-axis ratios measured using film in the solid water'' phantom. The resulting isodose distributions from both techniques were compared with the ion-chamber measurements in water for 7-, 12-, and 18-MeV electrons, and the second technique showed better agreement with the ion-chamber measurements than did the first technique. The differences were within a clinically acceptable range.

• OSTI ID: 5351375
• Journal Information: Medical Physics; (USA), Journal Name: Medical Physics; (USA) Vol. 16:6; ISSN 0094-2405; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
BEAMS
DEPTH DOSE DISTRIBUTIONS
DOSIMETRY
ELECTRON BEAMS
ELECTRON DOSIMETRY
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FILM DOSIMETRY
HYDROGEN COMPOUNDS
ISODOSE CURVES
LEPTON BEAMS
LEPTONS
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
MOCKUP
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
WATER